| Material | Code | Chemical Composition（%） | Surface Hardness（HSD） | |||||||||||
| C | Si | Mn | Cr | Ni | Mo | P | S | V | Cu | Mg | Barrel | Neck | ||
| Bainite Nodular Centrifugal Combined RollsⅠ | SAⅠ | 2.90-3.60 | 1.40-2.40 | 0.20-0.80 | 0.10-0.50 | 3.00-3.50 | 0.50-1.00 | ≤0.10 | ≤0.03 | 55-75 | 32-45 | |||
| Bainite Nodular Centrifugal Combined Rolls Ⅱ | SAⅡ | 2.90-3.60 | 1.20-2.00 | 0.20-0.80 | 0.30-1.50 | 3.50-4.50 | 0.50-1.00 | ≤0.10 | ≤0.03 | 60-80 | 32-45 | |||